A TORQUE LIMITER HAVING PRESSURE PLATE AND DIAPHRAGM SPRING

TECHNICAL FIELD

The present invention relates to torque limiters positioned between the engine and the transmission units in vehicles, in particular in vehicles having internal combustion engine.

PRIOR ART

Torque limiters are positioned between the engine and transmission units in internal combustion vehicles. Torque limiters prevent the excessive torque from being transmitted to the transmission units when the torque, obtained in the engine, is greater than a specific value. Accordingly, a drive disc is compressed between the plates and controls the transfer of the torque. In more details, the drive disc extends towards between a first cover and a second cover. There are friction linings at the two sides of the part of the drive disc which remains between covers. A pressure plate provided in the vicinity of the drive disc is pushed by a diaphragm spring and exerts pressure onto the drive disc. In other words, the drive disc is compressed between the pressure plate and one of the covers. During movement transmission, in order to prevent rotation of the pressure plate, the extensions provided on the outer wall of the pressure plate enter into the housings provided on the covers. For forming the housings, firstly cutout is formed on the covers and afterwards, the covers are formed. Forming of the covers leads to changing of shape of the housing. This leads to a difference from the desired dimension of the housing and this leads to movement of the extensions inside the housing in an undesired manner. This leads to undesired performance changes during movement transmission.

In the torque limiter disclosed in the application with number EP2226528, an extension provided on the outer wall of the pressure plate is placed into a hole provided on a first cover. The conical spring is rested onto a step, provided on a second cover on the outer wall thereof, and centered. This solution is space consuming radially outward the friction disc.

As a result, because of all of the abovementioned problems, an improvement is required in the related technical field. BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a torque limiter, for eliminating the above mentioned disadvantages and for bringing new advantages to the related technical field.

An object of the present invention is to provide a torque limiter with facilitated production and with reduced material cost.

In order to realize all of the abovementioned objects and the objects which are to be deducted from the detailed description below, the present invention is a torque limiter for a vehicle, in order to provide the torque to be lower than a predetermined value during power transmission between an engine and a transmission units of the vehicle, said torque limiter having at least one first cover, at least one second cover, at least one drive plate extending between said first cover and said second cover, at least one diaphragm spring rested to the first cover from one side and rested to a pressure plate from the other side and which compresses the drive plate between the pressure plate and the second cover. Accordingly, said torque limiter comprises at least one extension provided on one of the first cover and the pressure plate, and a housing provided on the other one of the first cover and the pressure plate, and the extension is at least partially placed into the housing.

In a possible embodiment of the present invention, the present invention is a torque limiter for a vehicle in order to provide the torque to be lower than a predetermined value during power transmission a damper between an engine and a transmission unit of the vehicle, said torque limiter having at least one first cover, at least one second cover, at least one drive plate extending between said first cover and said second cover from one side and connected to the damper from other side, at least one diaphragm spring rested to the first cover from one side and rested to a pressure plate from the other side and which compresses the drive plate between the pressure plate and the second cover. Accordingly, said torque limiter comprises at least one extension provided on one of the first cover and the pressure plate, and a housing provided on the other one of the first cover and the pressure plate, and the extension is at least partially placed into the housing.

In a possible embodiment of the present invention, the at least one extension is provided on an inner diameter of one of the first cover and the pressure plate

In a possible embodiment of the present invention, the at least one extension is provided on the first cover and the housing is provided on the pressure plate. In a possible embodiment of the present invention, the extension is provided in tab form extending from the inner wall of the first cover towards the second cover.

In a possible embodiment of the present invention, the housing is provided in recess form on the inner wall of the pressure plate.

In a possible embodiment of the present invention, the housing is provided in hole form on the pressure plate.

In a possible embodiment of the present invention, the housing and the extension are arranged so that no relative rotation is possible between the pressure plate and the first cover.

Prefereably, the housing and the extension are arranged so that no relative rotation is possible between the pressure plate and the first cover.

In a possible embodiment of the present invention, at least one centering housing is provided on the diaphragm spring and the extension can pass through the centering housing.

In a possible embodiment of the present invention, further comprising at least one centering housing, provided on the diaphragm spring and through which the extension can pass through, is provided on the diaphragm spring.

In a possible embodiment of the present invention, the centering housing is provided on the inner diameter of the diaphragm spring.

In a possible embodiment of the present invention, the centering housings of the diaphragm spring are grooves, these grooves cooperate with the extensions so that no relative rotation is possible between the diaphragm spring and the first cover.

In a possible embodiment of the present invention, at least one each friction linings are provided at the parts of the drive plate which contact the second cover and the pressure plate.

In a possible embodiment of the present invention, the housing is arranged radially inside the at least one friction lining. In a possible embodiment of the present invention, the drive plate comprising the diaphragm spring is centered by the extension.

In a possible embodiment of the present invention, the first cover has a plurality of extensions arranged radially inside of the diaphragm spring so that the diaphragm spring is centered by means of the extensions of the first cover.

In a possible embodiment of the present invention, the outer diameter of the drive plate is smaller than the outer diameter of the first cover or the second cover.

In a possible embodiment of the present invention, the first cover and the second cover are connected to the engine; and the drive plate is connected to the transmission units.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is the representative detailed cross-sectional view of the subject matter torque limiter.

Figure 2 is the representative isometric view of the first cover of the subject matter torque limiter.

Figure 3 is the representative isometric view of the pressure plate of the subject matter torque limiter.

Figure 4 is the representative isometric view of the diaphragm spring of the subject matter torque limiter.

DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the subject matter torque limiter 10 is explained with references to examples without forming any restrictive effect only in order to make the subject more understandable.

The subject matter torque limiter 10 has a first cover 20 and a second cover 30. There is at least one drive plate 60 extending towards between said first cover 20 and said second cover 30. There is at least one each friction lining 61 provided on the two sides of said drive plate 60. In a possible embodiment of the present invention, there is at least one pressure plate 50 provided between the first cover 20 and the drive plate 60 and there is at least one diaphragm spring 40 which pushes the pressure plate 50 towards the drive plate 60. In other words, the diaphragm spring 40 rested to the first cover 20 pushes the pressure plate 50 and provides the friction linings 61 to be compressed between the pressure plate 50 and the second cover 30.

At least one extension, provided on the inner wall of one of the first cover 20 and of the pressure plate 50, extends inwards a housing 51 provided on the other one of the first cover 20 and of the pressure plate 50. The extension 21 is at least partially placed into the housing 51 . In a possible embodiment of the present invention, the extension 21 is provided on the inner wall of the first cover 20. The extension 21 is essentially obtained by means of bending a part of the first cover 20 towards the side where the pressure plate 50 is provided. The housing 51 is provided on the pressure plate 50. The housing 51 can be provided in the form of a recess provided on the inner wall of the pressure plate 50 or in the form of a hole formed on the pressure plate 50. Pluralities of extensions 21 and housings 51 are provided within a multiple arrangement. Preferably the diaphragm spring 40 is centered by means of contacting the extension 21 from the inner or outer diameter thereof.

In a possible embodiment of the present invention, there is at least one centering housing 41 provided on the inner wall of the diaphragm spring 40. The extension 21 extending towards the housing 51 provided on the pressure plate 50 also passes through the centering housing 41 at the same time. Besides centering, the rotation of the diaphragm spring 40 is prevented thanks to the extension 21 .

Thanks to said embodiment, the pressure plate 50 is remained in a concentric manner with the torque limiter 10. Moreover, since there is no additional shaping with the part where the housing 51 is formed, the form of the housing 51 is protected and the extension 21 can be fixed into the housing 51 with the desired precision.

When propulsion comes from the engine, the movement is transferred, thanks to the friction linings 61 , between the drive plate 60 and, the pressure plate 50 and the second cover 30. Since the first and second covers are fixed together and since the extensions 21 can be fitted into the housing 51 with the desired measurement precision, rotational movement of the pressure plate 50 with respect to the second cover 30 is at least partially prevented. In other words, when compared with the prior art, the rotation which can be realized by the pressure plate 50 with respect to the second cover 30 is decreased or prevented. Since the extensions 21 are provided on the first cover 20 or on the inner wall of the pressure plate 50, the outer diameter of the pressure plate 50 can be provided in a smaller form in a different manner from the prior art. In other words, the pressure plate 50 can be made of smaller sized material. There is no loss of place radially outside the pressure plate.

Since the housings 51 are formed on the inner wall of the first cover 20 or on the pressure plate 50 in a different manner from the prior art, there remains no need to realize emptying at the bent parts of the first cover 20 and of the second cover 30. Thus, the production of the first cover 20 and of the second cover 30 is facilitated and the resistances thereof are increased.

By means of the passage of extensions 21 through the centering housings 41 which are provided on the diaphragm spring 40, the diaphragm spring 40 is positioned in a concentric manner with the torque limiter 10. Thus, there remains no need to use the outer wall of the diaphragm spring 40 for centering of the diaphragm spring 40. Thanks to this, changing of the radiuses at the bending parts of the first cover 20 in the desired manner is possible.

In a preferred embodiment of the present invention, the first cover 20 and the second cover 30 are connected to the internal combustion engine of the vehicle. The drive plate 60 is connected to a damper connected to the transmission units. Thus, since the drive plate 60 is positioned at the inner part of the first cover 20, the external diameter of the drive plate 60 is provided at a smaller diameter when compared with the external diameter of the first cover 20.

The protection scope of the present invention is set forth in the annexed claims and cannot be restricted to the illustrative disclosures given above, under the detailed description. It is because a person skilled in the relevant art can obviously produce similar embodiments under the light of the foregoing disclosures, without departing from the main principles of the present invention.

REFERENCE NUMBERS

10 Torque limiter

20 First cover

21 Extension 30 Second cover

40 Diaphragm spring

41 Centering housing 50 Pressure plate

51 Housing

60 Drive plate

61 Friction lining